Air filter



FIG. 1 is a perspective view of an air filter showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The present application is directed to the design illustrated in thedrawings. The broken line showing of the air filter and indicia areincluded for the purpose of illustrating portions of the article andform no part of the claimed design. In particular, the indicia on thecontrol panel visible in FIGS. 1 and 6 are illustrated in broken linesand form no part of the claimed design.

CLAIM The ornamental design for an air filter, as shown and described.